COS -19/6兀等于多少

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COS-19/6兀等于多少COS-19/6兀等于多少COS-19/6兀等于多少COS(-19/6兀)=cos(19/6兀)=cos(2π+7π/6)=cos(7π/6)=cos(π+π/6)=-cos

COS -19/6兀等于多少
COS -19/6兀等于多少

COS -19/6兀等于多少
COS (-19/6兀)=cos (19/6兀)
=cos(2π+7π/6)= cos(7π/6)
=cos(π+π/6)= -cos(π/6)=-√3/2.